<?php

/**
 * @see Database_Statement
 */
require_once 'database/classes/statement.class.php';

class Database_Statement_Pdo extends Database_Statement implements IteratorAggregate
{

	/**
	 * @var int
	 */
	protected $_fetchMode = PDO::FETCH_ASSOC;

	/**
	 * Prepare a string SQL statement and create a statement object.
	 *
	 * @param string $sql
	 * @return void
	 * @throws Exception
	 */
	protected function _prepare($sql)
	{
		try
		{
			/*check first 5 character of $sql if lacture*/
			$slave = false;
			if (strtolower(substr(trim(substr($sql, 0, 100)), 0, 6)) == 'select')
			{
				$slave = true;
			}
			$this -> _stmt = $this -> _adapter -> getConnection($slave) -> prepare($sql);
		}
		catch (PDOException $e)
		{
			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Bind a column of the statement result set to a PHP variable.
	 *
	 * @param string $column Name the column in the result set, either by
	 *                       position or by name.
	 * @param mixed  $param  Reference to the PHP variable containing the value.
	 * @param mixed  $type   OPTIONAL
	 * @return bool
	 * @throws Exception
	 */
	public function bindColumn($column, &$param, $type = null)
	{
		try
		{
			if ($type === null)
			{
				return $this -> _stmt -> bindColumn($column, $param);
			}
			else
			{
				return $this -> _stmt -> bindColumn($column, $param, $type);
			}
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Binds a parameter to the specified variable name.
	 *
	 * @param mixed $parameter Name the parameter, either integer or string.
	 * @param mixed $variable  Reference to PHP variable containing the value.
	 * @param mixed $type      OPTIONAL Datatype of SQL parameter.
	 * @param mixed $length    OPTIONAL Length of SQL parameter.
	 * @param mixed $options   OPTIONAL Other options.
	 * @return bool
	 * @throws Exception
	 */
	protected function _bindParam($parameter, &$variable, $type = null, $length = null, $options = null)
	{
		try
		{
			if ($type === null)
			{
				if (is_bool($variable))
				{
					$type = PDO::PARAM_BOOL;
				}
				elseif ($variable === null)
				{
					$type = PDO::PARAM_NULL;
				}
				elseif (is_integer($variable))
				{
					$type = PDO::PARAM_INT;
				}
				else
				{
					$type = PDO::PARAM_STR;
				}
			}
			return $this -> _stmt -> bindParam($parameter, $variable, $type, $length, $options);
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Binds a value to a parameter.
	 *
	 * @param mixed $parameter Name the parameter, either integer or string.
	 * @param mixed $value     Scalar value to bind to the parameter.
	 * @param mixed $type      OPTIONAL Datatype of the parameter.
	 * @return bool
	 * @throws Exception
	 */
	public function bindValue($parameter, $value, $type = null)
	{
		if (is_string($parameter) && $parameter[0] != ':')
		{
			$parameter = ":$parameter";
		}

		$this -> _bindParam[$parameter] = $value;

		try
		{
			if ($type === null)
			{
				return $this -> _stmt -> bindValue($parameter, $value);
			}
			else
			{
				return $this -> _stmt -> bindValue($parameter, $value, $type);
			}
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Closes the cursor, allowing the statement to be executed again.
	 *
	 * @return bool
	 * @throws Exception
	 */
	public function closeCursor()
	{
		try
		{
			return $this -> _stmt -> closeCursor();
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Returns the number of columns in the result set.
	 * Returns null if the statement has no result set metadata.
	 *
	 * @return int The number of columns.
	 * @throws Exception
	 */
	public function columnCount()
	{
		try
		{
			return $this -> _stmt -> columnCount();
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Retrieves the error code, if any, associated with the last operation on
	 * the statement handle.
	 *
	 * @return string error code.
	 * @throws Exception
	 */
	public function errorCode()
	{
		try
		{
			return $this -> _stmt -> errorCode();
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Retrieves an array of error information, if any, associated with the
	 * last operation on the statement handle.
	 *
	 * @return array
	 * @throws Exception
	 */
	public function errorInfo()
	{
		try
		{
			return $this -> _stmt -> errorInfo();
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Executes a prepared statement.
	 *
	 * @param array $params OPTIONAL Values to bind to parameter placeholders.
	 * @return bool
	 * @throws Exception
	 */
	public function _execute(array $params = null)
	{
		try
		{
			if ($params !== null)
			{
				return $this -> _stmt -> execute($params);
			}
			else
			{
				return $this -> _stmt -> execute();
			}
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), (int)$e -> getCode(), $e);
		}
	}

	/**
	 * Fetches a row from the result set.
	 *
	 * @param int $style  OPTIONAL Fetch mode for this fetch operation.
	 * @param int $cursor OPTIONAL Absolute, relative, or other.
	 * @param int $offset OPTIONAL Number for absolute or relative cursors.
	 * @return mixed Array, object, or scalar depending on fetch mode.
	 * @throws Exception
	 */
	public function fetch($style = null, $cursor = null, $offset = null)
	{
		if ($style === null)
		{
			$style = $this -> _fetchMode;
		}
		try
		{
			return $this -> _stmt -> fetch($style, $cursor, $offset);
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Required by IteratorAggregate interface
	 *
	 * @return IteratorIterator
	 */
	public function getIterator()
	{
		return new IteratorIterator($this -> _stmt);
	}

	/**
	 * Returns an array containing all of the result set rows.
	 *
	 * @param int $style OPTIONAL Fetch mode.
	 * @param int $col   OPTIONAL Column number, if fetch mode is by column.
	 * @return array Collection of rows, each in a format by the fetch mode.
	 * @throws Exception
	 */
	public function fetchAll($style = null, $col = null)
	{
		if ($style === null)
		{
			$style = $this -> _fetchMode;
		}
		try
		{
			if ($style == PDO::FETCH_COLUMN)
			{
				if ($col === null)
				{
					$col = 0;
				}
				return $this -> _stmt -> fetchAll($style, $col);
			}
			else
			{
				return $this -> _stmt -> fetchAll($style);
			}
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Returns a single column from the next row of a result set.
	 *
	 * @param int $col OPTIONAL Position of the column to fetch.
	 * @return string
	 * @throws Exception
	 */
	public function fetchColumn($col = 0)
	{
		try
		{
			return $this -> _stmt -> fetchColumn($col);
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Fetches the next row and returns it as an object.
	 *
	 * @param string $class  OPTIONAL Name of the class to create.
	 * @param array  $config OPTIONAL Constructor arguments for the class.
	 * @return mixed One object instance of the specified class.
	 * @throws Exception
	 */
	public function fetchObject($class = 'stdClass', array $config = array())
	{
		try
		{
			return $this -> _stmt -> fetchObject($class, $config);
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Retrieve a statement attribute.
	 *
	 * @param integer $key Attribute name.
	 * @return mixed      Attribute value.
	 * @throws Exception
	 */
	public function getAttribute($key)
	{
		try
		{
			return $this -> _stmt -> getAttribute($key);
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Returns metadata for a column in a result set.
	 *
	 * @param int $column
	 * @return mixed
	 * @throws Exception
	 */
	public function getColumnMeta($column)
	{
		try
		{
			return $this -> _stmt -> getColumnMeta($column);
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Retrieves the next rowset (result set) for a SQL statement that has
	 * multiple result sets.  An example is a stored procedure that returns
	 * the results of multiple queries.
	 *
	 * @return bool
	 * @throws Exception
	 */
	public function nextRowset()
	{
		try
		{
			return $this -> _stmt -> nextRowset();
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Returns the number of rows affected by the execution of the
	 * last INSERT, DELETE, or UPDATE statement executed by this
	 * statement object.
	 *
	 * @return int     The number of rows affected.
	 * @throws Exception
	 */
	public function rowCount()
	{
		try
		{
			return $this -> _stmt -> rowCount();
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Set a statement attribute.
	 *
	 * @param string $key Attribute name.
	 * @param mixed  $val Attribute value.
	 * @return bool
	 * @throws Exception
	 */
	public function setAttribute($key, $val)
	{
		try
		{
			return $this -> _stmt -> setAttribute($key, $val);
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

	/**
	 * Set the default fetch mode for this statement.
	 *
	 * @param int   $mode The fetch mode.
	 * @return bool
	 * @throws Exception
	 */
	public function setFetchMode($mode)
	{
		$this -> _fetchMode = $mode;
		try
		{
			return $this -> _stmt -> setFetchMode($mode);
		}
		catch (PDOException $e)
		{

			throw new Exception($e -> getMessage(), $e -> getCode(), $e);
		}
	}

}
